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ISO GD&T for a slot/elongated hole

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aidenawaits

aidenawaits

Mechanical
Oct 21, 2013
1
Hi all,

I'm trying to find the best way to dimension a slot that complies with current BS/ISO standards - I'm a pretty heavy user of "the search function", and have been googling like a fiend, but I cannot seem to find anything that states how it should be done (which is strange for such a seemingly common feature??).

Can anyone shed some light on this please? Cheers
 
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ISO or no ISO, there are several ways to dimension a slot based on its function.
What appears like an obround slot on the drawing may represent loosely toleranced clearance feature, or precise keyway, or something else.
Requirements for ends of the slot being rounded may vary as well.
Only you can make the final decision. This is why there is no “slot standard” out there.
 
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The ASME stds do have a little section on this, but I'm not sure for ISO.

Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​
 
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ASME Y14.5-2009 Fig. 1-29 and 1-30.

Although those barely count as "GD&T for a slot"
 
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